Thanks. I should have known that Intel would have a few extra address
bits kicking around.
Chuck Norcutt
Mark Dapoz wrote:
> Chuck Norcutt said the following on 3/17/09 11:39 AM:
>> That probably wasn't well stated. It would probably require some 64 bit
>> virtual machine hypervisor to manage the multiple 32 bit instances of
>> Windows. Maybe that's 64 bit Windows itself. I dunno. I'm sure that
>> Microsoft will be sure to charge us for each copy. :-)
>
> Almost all Intel processors after the Pentium Pro support 36-bit addressing
> using what's known as physical address extensions (PAE). That allows for a
> total of 64GB of physical memory while still running in 32-bit mode. Some
> versions of Windows supports PAE but the applications running on Windows are
> still limited to 4GB each.
>
> Having multiple cores makes no difference as all the memory is shared except
> on
> the new Nehalem based Xeon cpu's. In Nehalem each cpu has local memory and
> the
> OS needs to take that in account when assigning memory to tasks running on a
> particular core.
> -mark
>
>> Chuck Norcutt
>>
>> Chuck Norcutt wrote:
>>> I don't know but I wouldn't be surprised that 64 bit processors running
>>> in 32 bit mode could somehow virtualize up to a 4GB chunk of memory for
>>> their own use. But I should think that would entail multiple instances
>>> of Windows with each running on their own processor. I haven't paid any
>>> attention to Intel machine architecture in about 10 years. Probably too
>>> complicated for me now.
>>>
>>> Chuck Norcutt
>>>
>>> Jez Cunningham wrote:
>>>> I once saw a comment that a dual (or quad) core processor can use 3GB per
>>>> core - can anyone confirm that?Jez
>>>>
>>>> On Tue, Mar 17, 2009 at 2:33 AM, Chuck Norcutt <
>>>> chucknorcutt@xxxxxxxxxxxxxxxx> wrote:
>>>>
>>>>> 32 bit Windows won't use more than 3GB of that without some cryptic
>>>>> settings changes but at the price who cares if there's an unused 1GB of
>>>>> RAM.
>>>>>
>>>>> Chuck Norcutt
>>>>>
>
--
_________________________________________________________________
Options: http://lists.thomasclausen.net/mailman/listinfo/olympus
Archives: http://lists.thomasclausen.net/mailman/private/olympus/
Themed Olympus Photo Exhibition: http://www.tope.nl/
|